Performance Evaluation and Comparison of Schools with Masonry System Treated by Braces, FRP Strips and Friction Dampers Using Fragility Curves (Case Study: Khorram Abad)

Subject Areas : Structural Mechanics

Saeed BahariPour ¹ , Mahdi Nani ² , Mojtaba Hosseini ³ , Abdolreza sarvghad Moghadam ⁴ , Mehran Mehran S. Razzaghi ⁵

1 - Islamic Azad University of South Tehran Branch ,Tehran, Iran
2 - Assistant Professor, Engineering Department, Islamic Azad University of South Tehran, Tehran, Iran
3 - Associate professor, Department of Civil Engineering, Lorestan Unoversity, KhoramAbad, Iran
4 - Associate professor, Research Center, International Institute of Earthquake, Tehran, Iran
5 - Assistant Professor, Engineering Department, university of Qazvin, Qazvin, Iran

Received: 2023-08-07 Accepted : 2023-09-02 Published : 2023-09-01

Keywords: Fragility Curves, Concrete structure, Seismic Rehabilitation, FRP Strips, Frication Dampers,

Abstract :

Due to the importance of seismicity in the region of Iran, the improvement and retrofitting of structures has always been the focus of competent employers and engineers. In order to achieve the goals of this research, a three-story concrete school structure in need of improvement has been selected. Then, the investigation of possible improvement options (three improvement options: 1 with braces, 2 with friction damper, 3 using FRP in the columns) has been done in Opensees software. In the following, incremental nonlinear dynamic modeling and analysis under selected earthquake records using the recommended FEMA P695 accelerometers for co-based seismic records (5 acceleration maps for the far field and 5 acceleration maps for the near field) has been performed. Then a comparison between the fragility curves for different states has been made. In this research, the behavior of the building against different earthquake intensities is shown According to the results obtained from other non-linear analyses, it can be seen that the maximum capacity obtained is in good agreement with the results of these analyzes and this method is very suitable for evaluating the behavior of buildings and ultimate capacities against earthquakes. Also, it can be a good alternative method for approximate methods such as pushover analysis to determine the performance level of the building and to determine the behavior of the building.